Printer s qttoiisr



R. 1. SEVEBEN.

PRINTER'S QUOIN.

APPLICATION men MAY 26. ms.

Patented Dec. 9, 1919.

Ede/Zia? 715776156, W I 7205 7% Jfl gran ROBERT J. SEVEREN, OF CHICAGO, ILLINOIS.

PRINTERS QUOIN.

Specification of Letters Patent.

Fatented Dec. 9, 1919.

Application filed. May 26, 1919. Serial No. 299,751.

To all whom it may concern Be it known-that I, ROBERT J. Snvnnnn, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Printers Quoins; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in printers quoins adapted for locking printing forms in chases. The invention refers more particularly to improvements in printing quoins, which when adjusted to firmly lock the form in the chase, are sufficiently flexible to maintain the locking pressure in the event of slight shrinkage of the form; to improvements whereby the quoin members may separate upon shrinkage of the form without liability, however, of the quoin members shifting laterally relatively to each other so as to fall or jump out of the chase, and to improvements whereby the quoin members may be locked firmly together in adjusted positions by suitable self locking mechanism which permits them to be moved endwise in both directions relatively to each other to lock or release the form without necessity of manually releasing the locking means.

The invention consists in the combination and arrangements of the parts shown in the drawings and described in the specification and is pointed out in the appended claims.

In the drawings, Figure 1 is a side elevation of'a printers quoin embodying my invention.-

Fig. 2 is a longitudinal section thereof on the lines 22 of Figs. 8 and 4:.

F ig. 8 is a transverse section on the line 3-3 of Fig. 2.

Fig. 4 is a face view of one of the quoin which are tapered and fit upon each other in such manner that relative endwise movement of the members varies the overall width of the quoin.

The quoin members are provided on their tapered faces with longitudinal central ribs 11 .which bear against and slide upon each other. At the wider ends of said quoin members said ribs are flanked by lugs 12, thereby forming between them guide recesses 1f for the ribs 11 to maintain said ribs always parallel. The said ribs are formed at th narrower ends of the quoin members with short longitudinal recesses or notches 15 and the quoin members are provided at the sides of the ribs, and below the planes of the bearing faces of the ribs, with key lugs 16 of usual formation to cooperate with the usual quoin operating or adjusting key.

Refer mg now to the self locking mechanism constituting the present invention, the same is made as follows:

The rib 11 of each quoin member is provided on its inner fiat bearing face with a plurality of closely spaced shallow depressions or sockets 17 which extend throughout the principal length of the rib, beginning at the recess 15 at the narrower end of the member. Each rib is also provided adjacent its wider end and in line with the depressions 17 with an opening 18 to receive a locking pin 19. Sail locking pin is formed at one end with a head and is rounded at its into the outer ends of the openings 18. The

inner ends of the openings 18 are reduced and the locking pins fit closely therein, while the outer ends of said openings and the shoulders in said openings between the larger and smaller diameters thereof serve as a means to limit the total inward movement of the pins under the action of the quoin is placed between the furniture in the chase in the usual manner and the quoin members are shifted endwise relatively to each other by the use of a quoin key engaging the lugs 16 to increase the overall width of the quoin ant to thereby lock the form in s is the quoin members are thus adjusted endwise' relatively to each other, the locking pins 19 of each quoin member successively pass over and engage the shallow depressions or recesses 17 of the other quoin member until the final locking position is reached, in which position the pins, 19 engage their proper sockets to prevent endwise displacement of the members in a direction to release the locks. By reason of the fact that the ends of the pins are rounded and that the bottoms of the recesses 17 are correspondingly rounded and the recessesare shallow, it will be apparent that said pins will automatically pass from one looking recess or depression to the other, regardless.

of whether the quoin 11-l11b6lS are being adjusted to lock it 36801 es in iecessary to manually release said locking pins when aform is to be 1111. locked for removal or when it is to bore: leased.

inev surmgs 9 are mace of considerable.

t ti 8 n so that in the event of a shrinkage 1 form such as may occur due tothe rin of certain type metal, or to the ma? rials used, as when the form contains elec: r type cuts, and also to imperfectjustifir at' form to prevent the quoin from jumping oat of place and releasing the locking pres sure. This lock retaining action of the quoin is due to the engagement of the rounded ends of the locking shaped sockets 17 which serve, not only to self center the pins in their sockets, but also to prevent relative lateral movement of the quoin members and to the follow up action of the springs. forms be locked under such tension that they will be reliably held in the chase under all practical working conditions but it is objectionable that the tension be so great as to tend to cause the form to spring upwardly under the vibration of the press or under the action of the press cylinder In.

the construction described it becomes possible to regulate the locking tension of the.

tion herein shown is such as to cause the quoins to equalize and maintain their teno form or to release it. Thus.

on, the quoin members are permitted; to, htly sei'iarate and, at the same timeer locking tension is maintained on the.

pins with the like,

It is necessary that the.

sion on the form in the event that the quoins are locked with variable tension or in the event that vibration of the press should tend to cause them to work loose. This feature of the quoin construction is of great importance inasmuch as the loosening of forms in the press often causes great damage to the press cylinder and other parts of the press.

Another feature of advantage of the construction described is the formation of the ends of the locking'pins and their cooperat ing recess or depression whereby the said pinsvwill ride from one recess or depression to theother Without manually releasing the locking. pins, such as would occur in one direction or adjustment if an ordinary pawl or ratchet locking mechanism be employed. Thusthe, quoins may be quickly released or unlocked inasmuch, as all that is required to unlock the quoins is the usual locking action. of the locking key. Such releasing of-the quoins is often required a great many times in locking up a form in order to corroot the re ist-er of cases et cetera so that the automaticrelease becomes an important factor; in the time saved. Furthermore, the self locking feature avoids the likelihood the pressman forgetting to lock the quoins when once set.

It Will be. understood that said recesses or depressions 17 are closely spaced. so as to. permit, finely graduated adjustments of the quoin, members and the form of thecoacting pins and sockets insures self centering; of. the pins in the sockets.

In order that the person using the quoin may know, when the locking pins are seated in their sockets or depressions 17, one or both of said quoin members are provided with a series of short transverse gage marks which are adapted to register with other gage marks 22 at the wider ends of the quoin members, as most clearly shown in Fig. 1. The gage marks 21 are so spaced relatively to the spaces of the centers of the sockets or depressions 17 that when a gage mark 21 of one member is in line with the gagemarr 22 of the other member, it will be known that the locking pins are seated in and interlocked with the proper sockets or depressions 17.

I claim. as my invention:

1. Printers quoin comprising endwise relatively movable members having tapered coacting faces, said members being provided at said coacting faces with locking means spring actuated in a direction transverse to said faces and operable to permit endwise movement of said members in both directions;

2. Printers quoin comprising endwise relatively movable members having tapered coact-ing faces, said members being provided at said coacting faces with self centering locking means, spring actuated in a direcshallow, round bottom recesses and With tion transverse to said faces permitting endspring-pressed, round ended pins to engage l0 Wise movement of said members, when so said recesses. locked, in both directions. In WitnessWhereof I claim the foregoing 3. Printers quoin comprising endwise relas my invention, I hereunto append my sigatively movable members having tapered nature at Chicago, Illinois, this 23rd day coacting faces, said members being provided of May, 1919. at said coacting faces with closely spaced, ROBERT J. SEVEREN. 

